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A repeat servo motor problem on a citation results in the temporary loss of aircraft control, a heading track and altitude deviation while on approach frequency with S56, ut.
| Attributes | |
| ACN | 609957 |
| Time | |
| Date | 200402 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : slc.vortac |
| State Reference | UT |
| Altitude | msl bound lower : 10000 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | IMC |
| Weather Elements | Snow Rain Ice Turbulence |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : s56.tracon |
| Operator | general aviation : corporate |
| Make Model Name | Citationjet, C525/C526 |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | other |
| Flight Phase | descent : intermediate altitude |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : corporate |
| Function | flight crew : single pilot |
| Qualification | pilot : multi engine pilot : cfi pilot : instrument pilot : atp pilot : private pilot : commercial |
| Experience | flight time last 90 days : 90 flight time total : 6400 flight time type : 330 |
| ASRS Report | 609957 |
| Person 2 | |
| Function | observation : passenger |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : excursion from assigned altitude non adherence : clearance non adherence : published procedure other spatial deviation |
| Independent Detector | other flight crewa other other : 2 pax |
| Resolutory Action | aircraft : equipment problem dissipated flight crew : overrode automation flight crew : returned to intended or assigned course flight crew : overcame equipment problem other |
| Consequence | other Other |
| Factors | |
| Maintenance | performance deficiency : testing performance deficiency : fault isolation performance deficiency : repair |
| Supplementary | |
| Problem Areas | Aircraft Environmental Factor Maintenance Human Performance Passenger Human Performance |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Electrical problem, unable to duplicate, causing erroneous data to EFIS. On leveloff was asked to maintain 170 KTS. Upon reaching 10000 ft, aircraft flight director showed a pitch-up of 20 degrees nose up. Immediately disconnected autoplt and large manual inputs to correct attitude. Aircraft gained 1000 ft when attempting to recover control. At the same time the aircraft flew through the localizer needle and would not navigation the localizer. After disengaging and then reengaging the autoplt the aircraft flew normally. Following this flight I made 2 flts to duplicate this scenario and could not duplicate the trim runaway situation. 1) during the approach mode, I had another pilot in the cockpit. Although single pilot operation, the other pilot had undertaken training 2 weeks earlier. His presence in the cockpit was more of a hindrance than assistance, as I had a pilot that I assumed would assist on radio and was slow to react to responses from ATC. 2) failure to fully advise ATC of potential emergency situation. I advised ATC of pitch control problem, but failed to declare emergency. ATC continued to rattle off instructions due to volume of traffic. The aircraft had previously had an autoplt pitch servo problem, that the manufacturer could not duplicate. I will continue to try to duplicate this problem.
Original NASA ASRS Text
Title: A REPEAT SERVO MOTOR PROB ON A CITATION RESULTS IN THE TEMPORARY LOSS OF ACFT CTL, A HEADING TRACK AND ALTDEV WHILE ON APCH FREQ WITH S56, UT.
Narrative: ELECTRICAL PROB, UNABLE TO DUPLICATE, CAUSING ERRONEOUS DATA TO EFIS. ON LEVELOFF WAS ASKED TO MAINTAIN 170 KTS. UPON REACHING 10000 FT, ACFT FLT DIRECTOR SHOWED A PITCH-UP OF 20 DEGS NOSE UP. IMMEDIATELY DISCONNECTED AUTOPLT AND LARGE MANUAL INPUTS TO CORRECT ATTITUDE. ACFT GAINED 1000 FT WHEN ATTEMPTING TO RECOVER CTL. AT THE SAME TIME THE ACFT FLEW THROUGH THE LOC NEEDLE AND WOULD NOT NAV THE LOC. AFTER DISENGAGING AND THEN REENGAGING THE AUTOPLT THE ACFT FLEW NORMALLY. FOLLOWING THIS FLT I MADE 2 FLTS TO DUPLICATE THIS SCENARIO AND COULD NOT DUPLICATE THE TRIM RUNAWAY SIT. 1) DURING THE APCH MODE, I HAD ANOTHER PLT IN THE COCKPIT. ALTHOUGH SINGLE PLT OP, THE OTHER PLT HAD UNDERTAKEN TRAINING 2 WKS EARLIER. HIS PRESENCE IN THE COCKPIT WAS MORE OF A HINDRANCE THAN ASSISTANCE, AS I HAD A PLT THAT I ASSUMED WOULD ASSIST ON RADIO AND WAS SLOW TO REACT TO RESPONSES FROM ATC. 2) FAILURE TO FULLY ADVISE ATC OF POTENTIAL EMER SIT. I ADVISED ATC OF PITCH CTL PROB, BUT FAILED TO DECLARE EMER. ATC CONTINUED TO RATTLE OFF INSTRUCTIONS DUE TO VOLUME OF TFC. THE ACFT HAD PREVIOUSLY HAD AN AUTOPLT PITCH SERVO PROB, THAT THE MANUFACTURER COULD NOT DUPLICATE. I WILL CONTINUE TO TRY TO DUPLICATE THIS PROB.
Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.